Sound-amplifier.



A. HEWITT,

SOUND AMPLIFIER.

'APPLIoAjrIoN FILED APR. 14, 19ml.

?a.tented Sept. 26, 193.1.

WITNESSES o-"adapted to ride within and be The downwardly e'ktending elbow portion of thev sound lconveying tube .Iis suitabl f pivoted to the top 6 and is1 connected Wit I the sound amplifier 7 through' a hole 16 suit- 5 ably provided in the top 6.' Mounted upon the top 6 of the cabinet is a casing ,17 inclosing the turntable 13 and the re reducing parts of the talking machine.` T e top 1-8 of the casing 17 is .hinged at 19 thereby lo permitting easy access to the reproducing parts heretofore mentioned Means are provided for concentrating the amplified sound, such means being of course capable of various embodiments. In certain l5 constructions, it is desirable to defiect the amplified sound before or during concentration. Means are provided, therefore, for this purpose, and in the particular embodiment which I have selected to illustrate my 20 invention and which is shown in the accomangle, although it is to be understood that the defiecting surface is not necessarily joined or made integral with `the amplifier, but may in certain constructions-be separated therefrom. The front wall 20'has an offset 23 in close Contact with the inner surface of the front 2 and the defiecting sur-4 face 22 terminates in an upwardly extending portion orlip 24, which is also in close contact with the inner surface of the front 2.

shown: in Fig. 1 the mouth 25 of the sound amplifier substantially coincides with the opening" 26 of the cabinet 1 and doors 27,. are provided'by which the opening 26 and' at the same time the mouth 25 may be closed.

40 I have shown a convenient and useful manner of mounting the doors 27 whereby they may be completely opened or 'closed or occlipy any intermediate position. I accom-v plish this by providing tracks 28 placed within the recesses 29 one on either side of the opening 26, each adapted to receive the adjacent door, the inward movement of which is determined by Stop blocks 30. pon the doors 27 are mounted pins 31 l guided by the tracks 28. When the mouth 25 is opened by "sliding the doors 27 the sounds issuing from the mouth may be deiiected by arranging the doors in any desired position.

Indicated by dotted lines 3,2 are sound waves passing through the sound amplifier from the sound conveying tube. As these sound. Waves strike the defiecting surface 22 they are deflected at angles which may be predetermined. The defiecting surface 22v may be constructed so that4 the deflected sound waves 33 will all pass through the mouth of the sound amplifier and the opening '26 of its cabinet in certain lines of direction which ultimately meet in a point 34; or

I claim and desire to a series of points forming a line. I-term this line the line of concentration. It is obvious that by altering the defiecting surface 22 andthe angle at which it is mounted the line of concentrationmay be determined er, I construct the easing of the sound yamplifier of plaster-of-Paris, cement or some other suitable like material which is rigid and substantially inelastic and non-vibratory and I have alsoy found itdesirable to make the interior of the casing smooth. s*

In the accompanying drawings and in the foregoing description I have shown the ap plication of my improved sound amplifier in an inclosing talking machine, cabinet or casing and connected to the reproducing parts of a talking machine, but do not limit myself to its use in that connection alone for it is obvious that it can be used in the ordinary talking machine'with the sound amplifier mounted upon a suitable ,bracket or otherwise and vextending upwardly and that it also can be used in any connection, the purpose. of which is to amplify sounds. y

Various changes could be made in the details of the construction, combination and arrangement of my improved sound amplifier illustrated, without departing from the spirit and scope of my invention.

Having thus fully described my invention,

protect byLetters Patent of the United States 1. A sound amplifying horn having its outerend closed and provided with a lateral outletLand having alfoc'using surface, arranged to directly reflect all waves convergingly through said outlet toward a line.

2. A sound' amplifying horn' provided' with means for concentrating the sound waves substantially along a line.

3. A sound amplifying horn comprising a conical portion and provided with a restricted outlet in one side thereof, and means closing vthe end of said conical portion for directly reflecting all of the sound waves through said outlet in planes converging ltoward common line. V

4, A sound amplifying horn comprising a conical portion and provided with an loutlet onv one side thereof, and means closing the end of said conical portion for reflecting the sound waves through said outlet and concentrating the same in planes meeting in a line.

45. A sound amplifying horn comprising a conical portion and provided with an outlet in one side thereof, and means closing the `end of said conical portion for refiecting the sound. waves through saidoutletl and concentrating the same along a transverse line.

6. A sound amplifying horn comprising a flat conical portion having a closed outer end and provided with an outlet on its flat side adjacent to said end, said end being se constructed as to reflect the sound Waves through said opening and concentrate the same in a line.

7. A sound amplifier comprising a `horn provided with a lateral opening in one side thereof and formed of a substantially non vibratory material, arranged to direct all sound Waves through said opening and oonvergentlyl toward a line.

8. A sound amplilier comprising a horn provided-With a lateral opening in one side thereof and lformed of a substantially inelastie material, arranged to direct all sound Waves through said opening and convergently-tovvard a line.

9. A*` Sound amplifier having a lateral outlet, and provided with a oylindrically curved end elosure arranged to reilect sound waves through said outlet and concentrateA saidv `Waves to meetin a transverse line. v

having ajsubstan 10.' A sound aniplilier tally D-shaped cross section iucreasingtq- Ward its outlet end, and having a 'lateral outlet adjacent to said endfa'nd provided Y with a curved closure extendingaoross said 1' end arranged to reflect sound Waves said outlet and concentrate them' along a' transverse focal line. Y

11. A sound amplifier, a-lateral thro ugh 3 outlet registerable with'a Cabinet aperture my hand this lthday of April, A, D. 1908. 40

ALBERTS HEWITT.

Witnesses:

'Fiumara C. Enma-ninna?,

FREDERICK A. BLOUNT.' 

